Ground-based tests of JEM-EUSO components at the Telescope Array site, “EUSO-TA”

Abstract

We are conducting tests of optical and electronics components of JEMEUSO at the Telescope Array site in Utah with a ground-based “EUSO-TA” detector. The tests will include an engineering validation of the detector, cross-calibration of EUSO-TA with the TA fluorescence detector and observations of air shower events. Also, the proximity of the TA’s Electron Light Source will allow for convenient use of this calibration device. In this paper, we report initial results obtained with the EUSO-TA telescope.

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Notes

  1. 1.

    The actual number of frames requested for each threshold level has yet to be determined, but initial measurements show that the single photoelectron signal should be lower then 1 % of the maximal signal, requiring more then 10000 GTUs

  2. 2.

    To trigger on a rising slope, the initial signal must be below the threshold value. Therefore, for thresholds below the pedestal value the detection is performed when the signal fluctuates below the threshold value and then comes back to the baseline. Therefore lowering the threshold value in this range cuts the negative fluctuations causing a drop in number of detections

  3. 3.

    The total gain of a pixel corresponds to the distance between the pedestal peak and the single photoelectron peak.

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Acknowledgements

This work was partially supported by Basic Science Interdisciplinary Research Projects of RIKEN and JSPS KAKENHI Grant (22340063, 23340081, and 24244042), by the Inter-University Research Program of the Institute for Cosmic Ray Research, by the Italian Ministry of Foreign Affairs, General Direction for the Cultural Promotion and Cooperation and by the ’Helmholtz Alliance for Astroparticle Physics HAP’ funded by the Initiative and Networking Fund of the Helmholtz Association, Germany. LWP acknowledges support by JSPS.

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Correspondence to L. W. Piotrowski.

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Contribution to the special issue ‘JEM-EUSO’ of Experimental Astronomy

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Adams, J.H., Ahmad, S., Albert, J.-. et al. Ground-based tests of JEM-EUSO components at the Telescope Array site, “EUSO-TA”. Exp Astron 40, 301–314 (2015). https://doi.org/10.1007/s10686-015-9441-6

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Keywords

  • JEM-EUSO
  • EUSO-TA
  • Telescope array
  • Ultra high energy cosmic rays